Damper control



Feb. 26, 1935. R. c. YATES ET AL DAMPER CONTROL Filed March 15, 1934 4 Sheets-Sheet 1 A M. Millward 7?.6'. Yale: R

/I Home y Feb. 26, 1935. R. c. YATES ET AL DAMPER CONTROL Filed March 15, 1934 4 Sheets-Sheet 2 Inventor! S e m Y R A .M. Millward Feb. 26, 1935. R. .c. YATI'ES El AL v R C. Yafes A M. Millwara flllorney I I nveniorg 26, 1935- R. c. YATES El AL 1,992,456

DAMPER CONTROL Filed March 15, 1934 .4 Sheets-Sheet 4 V I nvenior;

7? C Yaies A M.Millward Patented Feb. 26, 1935 earner caries DAMPER CONTROL Richard Charles Yates, Cincinnati, Ohio, and Albert Morris Millward, Southgate, Ky.

Application March 15,

2 Claims.

This invention appertains to new and useful improvements in damper controls for furnaces, the principal object of the invention being to provide a control which will be accurate in operation and which will prevent overheating of the furnace and subsequent damage to the heating system.

Another important object of the invention is to provide a furnace control which in operation will not be susceptible to the development of defects, in that the same will be foolproof in operation, due principally to the simplicity of construction.

Other important objects and advantages of the la invention will become apparent to the reader of the following specification.

In the drawings:- Figure 1 represents a side elevational view of a furnace equipped with the novel control. 20 Figure 2 represents a vertical sectional View through the diaphragm unit of the control.

Figure 3 represents a vertical sectional view taken substantially on line 3--3 of Figure 1. Figure 4 represents a side elevational view of 25 the flue shown equipped with the pressure generating coil.

Figure 5 represents a perspective view of the bowl portion of the diaphragm unit.

Figure 6 represents a perspective view of the 30 diaphragm unit cover.

Figure 7 represents a perspective view of the diaphragm disk.

Figure 8 represents a perspective view of the draft control lever actuating means.

Figure 9 represents a perspective view of control line lever hook.

Figure 10 represents a perspective view of the bracket for the draft line control rocker.

Referring to the. drawings wherein like nu- 40 merals designate like parts, it can be seen that numeral 5 denotes the furnace proper, which includes the draft door 6 and the draft door control line '7, the latter being disposed over a pulley 8 mounted at the upper portion of the furnace and connected to the lower hook 9 of the hook unit 10 which is secured to the forward end of the rocker lever 11. The upper hock 12 is connected to the line section 13 which is disposed over the pulley 14 and which, as is shown in Figure 1, is connected to the flue check draft door 15.

Numeral 16 represents the diaphragm unit bowl which is provided with leg portions 17 resting upon the top of the furnace 5. This bowl 16 has a bracketl'? secured to the bottom thereof, bifurcated, as at 18, for rockably supporting the the 1934, Serial No.- 715,748

lever 11. This lever 11 is provided with thead justable weight 20 at its forward end portion, and with a depending weight unit 21 at its'rear end portion.

Suitably packed through the gland 22 is a stem 23, bearing at its lower end on the concavity 24 in the lever 11. The upper end of the stem 23 is provided with a mushroom head 25 bearing against the diaphragm disk 26. This disk 26 is interposed between the cover plate 27 and the circumferentially flanged portion 28 of the bowl 16, these parts being secured together by bolts 29.

A nozzle unit 30 is threaded into the cover 2'? and has a pipe 31 extending fromthe same to connect .to a coil 32 convoluted around the flue pipe 33, as shown in Figure l. The'closed end of this coil 32 is connected by a spring 34 to an adjacent portion of the conduit 31, as shown in Figure 4, so as to retain the same compactly and steadily on the flue 33.

As can be clearly seen in Figure-2, the mushroom head 25 bears against the diaphragm 26, and it is to be understood that the conduit 31 is to be filled with a fluid, such as water or the like.

In operation, when coal or other fuel is placed in the fire box of the furnace 5, heat develops anda proportionate portion of this heat is carried off by way of the flue 33.

The heat passing by way of the flue 33 is transmitted to the fluid content of the line 31' and develops a pressure which acts against the diaphragm 26. This diaphragm. in response to the pressure of the line 31, acts against the mushroom head 25 and forces the stem 23 downward- 1y, This rocks the lever 11 and lowers the hook end of the arm. This operation of the arm, obviously, lowers the draft door 6 and shuts off draft through the fire bed, and at the same time the lever 11 opens the check draft door 15.

When the pressure in the line 31 ceases, to an extent suificient to cause the elevation of the front end of the arm draft door 6 will be opened and the check draft door 15 closed.

While the foregoing specification sets forth th inven on specific terms, it is to be underchange: in the nape, size me be resorted to without deting from the spirit and scope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:

i. In a furnace provided with a flue pipe and wherein. a draft door and a check draft door are controlled by a thermostat acted upon by heated fluid passing from the furnace, the improvement comprising a closed bowl adapted to be connected with a tube containing expansible fluid and closed at its outer end and having its outer portion coiled about said flue pipe, said bowl having legs resting on the top of the furnace, a diaphragm disposed in said bowl, a stem, at the opposite side of the diaphragm to said tube connection, and movable downwardly by said diaphragm and through the bottom of the bowl, a vertically swingable lever disposed below and fulcrumed to said bowl and having one of its arms movable downwardly by said stem, and suitably guided cables connected to said lever arm and also connected to said draft and said check draft door, respectively.

2. In a furnace provided with a flue pipe and wherein a draft door and a check draft door are controlled by a thermostat acted upon by heated fluid passing from the furnace, the improvement comprising a closed bowl adapted to be connect ed with a tube containing expansible fluid and closed at its outer end and having its outer por- 7 tion coiled about said fluid pipe, said bowl having legs resting on the top of the furnace, a diaphragm disposed in said bowl, a stem, at the opposite side of the diaphragm to said tube connection, and movable downwardly by said diaphragm and through the bottom of the bowl, a vertically swingable lever disposed below and fulcrumed to said bowl and having one of its arms movable downwardly by said stem, and suitably guided cables connected to said lever arm and also connected to said draft and said check draft door, respectively, the said arm of the lever being bles being connected directly to said hooks.

RICHARD c. YATES. ALBERT MORRIS MILLWARD. 

